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# TODO:
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## 1. double scans in projections
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- first for special aggrigations and singular columns
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- Then in group by node decide if we have special group by aggregations
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- If sp_gb_agg exists, the entire groupby aggregation is done in C plugin
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- If not, group by is done in SQL
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## 2. ColRef supports multiple objects
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- A.a = B.b then in projection A.a B.b will refer to same projection
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- Colref::ProjEq(ColRef v) => this == v or v in this.proj_eqs
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## 3. External Optimizing Tools
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- mold/sold instead of builtin linker will boost linker speed
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- bolt that have binary optimizer
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